curl --request POST \
  --url https://api.example.com/v1/users/{user_id}/roles \
  --header 'Content-Type: application/json' \
  --data '
{
  "role_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

{
  "code": "roles.invalid_role_name",
  "message": "Invalid role name"
}